In looking through quite a few lead records i'm noticing that when there is click activity present there is no open email activity logged.

Is this normal behavior? I can assume that if a lead clicked an email that they also opened it, but i'm now concerned about the accuracy of our reporting metrics. I'm aware that opens are not a reliable and that if images are not downloaded, it does not log as an open. I did, however, think that if someone engaged with the email by clicking an open would also be logged. Is there anyone who can share some insight on this?

The lead has to download images on the email for an Opened Email activity to be recognized. If the lead has an email client that doesn't download images and clicks the email link, then your activity log will have a clicked link in email without an open email event as you are seeing.